It assesses cognitive abilities such as memory, attention, orientation to time and place, use of language, and abilities to carry out various tasks and follow instructions.

Reasoning, abstract thinking, and problem solving are tested.

Neuropsychological testing gives a more accurate diagnosis of the problems and thus can help in treatment planning.

The tests are repeated periodically to see how well treatment is working and check for new problems.

Imaging studies: Generally, brain scans such as CT scan and
MRI are of little use in diagnosing dementia in people with
Parkinson's disease. Positron emission tomographic (PET) scan may help distinguish dementia from depression and similar conditions in
Parkinson's disease.

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